/*
 * Copyright (C) 2015, United States Government, as represented by the 
 * Administrator of the National Aeronautics and Space Administration.
 * All rights reserved.
 *
 * The PSYCO: A Predicate-based Symbolic Compositional Reasoning environment 
 * platform is licensed under the Apache License, Version 2.0 (the "License"); you 
 * may not use this file except in compliance with the License. You may obtain a 
 * copy of the License at http://www.apache.org/licenses/LICENSE-2.0. 
 *
 * Unless required by applicable law or agreed to in writing, software distributed 
 * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR 
 * CONDITIONS OF ANY KIND, either express or implied. See the License for the 
 * specific language governing permissions and limitations under the License.
 */
package gov.nasa.jpf.constraints.expressions;

public enum Quantifier {
  FORALL("forall") {
    public Quantifier negate() {
      return EXISTS;
    }
  },
  EXISTS("exists") {
    public Quantifier negate() {
      return FORALL;
    }
  };

  private final String str;

  private Quantifier(String str) {
    this.str = str;
  }

  public abstract Quantifier negate();

  @Override
  public String toString() {
    return str;
  }
}
